Once Edwin has been entered, it can be exited in the following ways:
suspend-edwin).  The call to the
procedure edit that entered Edwin returns normally.  A subsequent
call to edit will resume Edwin where it was stopped.
     save-buffers-kill-edwin).  This is like the suspend-edwin
command, except that a subsequent call to edit will reinitialize
the editor.
     suspend-scheme).  When Scheme is
resumed (using the command interpreter's job-control commands), Edwin is
automatically restarted where it was stopped.  This command is identical
to the C-x C-z command of GNU Emacs.
     save-buffers-kill-scheme).  Control is returned to the operating
system's command interpreter, and the Scheme process is terminated. 
This command is identical to the C-x C-c command of GNU
Emacs.